Appel, V."Companion Nomographs for Testing the Significance of the Difference between Uncorrelated Percentages."Psychometrika, III (1952), 325- 330 .
2.
Lawshe, C. H. and Baker, P. C."Three Aids in the Evaluation of the Significance of the Difference between Percentages."EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, X (1950), 263-270.
3.
McNemar, Q."Note on the Sampling Error of the Difference between Correlated Proportions or Percentages."Psychometrika, XII ( 1947), 153- 157.
4.
McNemar, Q.Psychological Statistics. New York: Wiley, 1949 .
5.
Zubin, J."Nomographs for Determining the Significance of the Differences between Frequencies of Events in Two Contrasted Series or Groups."Journal of the American Statistical Association, XXIV ( 1939), 539-544.